RE: [Hibernate] Polymorphic queries, where and order by

[March, Andres]

We can’t use H3 unfortunately because we do not have enough time to add H3 support to Spring.  Is there any way this patch can be applied to H2?   From: William Draï [mailto:[EMAIL PROTECTED] Sent: Wednesday, September 29, 2004 11:22 AM To: Emmanuel Bernard Cc: March, Andres; [EMAIL PROTECTED] Subject: Re: [Hibernate] Polymorphic queries, where and order by   I haven't yet tested with H3. I think there were no change logs related to this. I will try as soon as I have enough time. We can live without this "feature" for a few more weeks. Thank you for your anwser. Speaking from memory, Gavin did implement something on the (now dead 2.2 branch). It now has been reporded on H3. Did you test it? I can remembe, he'd implemented the transparent subclassing (no special keyword). March, Andres wrote: I'm sorry if I expand the subject a little.  We pulled a patch off the forums some where that allows us to order by any association.  I was wondering why this patch never got applied.  It seems it would be useful in this situation as well.  I am really uncomfortable using a patched hibernate because there are less eyes on it and it makes upgrading harder.  I can submit the patch as we've applied it if you like.  But also let me know if there is any reason for not allowing this type of functionality.  It has been extremely useful to us in our searches as I think it would be to others.     -----Original Message-----From: [EMAIL PROTECTED] [mailto:hibernate-devel-[EMAIL PROTECTED]] On Behalf Of William DraïSent: Tuesday, September 28, 2004 1:31 AMTo: [EMAIL PROTECTED]Subject: [Hibernate] Polymorphic queries, where and order by Let's say we have the following (simplified) mapping : <class name="A" table="T">    <property name="field1" type="string"/>     <subclass name="B">       <property name="field2" type="string"/>    </subclass></class> Now we can execute any HQL query on the class A using the field1, forexample"from A a where a.field1 like 'anything%'" or "from A a order by a.field1" The problems come when we want to use the field2 with the same queries.Of couse in simple SQL it is possible to doselect * from T order by field2 But in HQL, "from A a order by a.field2" rightly fails because field2 isnot definedfor class A. This causes problems in sortable or filtered data tables where the usercan sort or filterby any column he wants.There is currently only two options :- allowing to sort only on columns of class A : possible but my userswon't be really happy- "casting" the query to class B when the user sorts on a column ofclass B : that means that the results    count of the query is not the same when it is sorted than when it isnot ; it completely breaks the    semantics of sorting/filtering I understand it does not follow the OO approach of HQL but it would bereally useful to have an additionalsyntax to allow using fields of the subclass in HQL queries, somethinglike "select a from A+ a order by a.field2",or maybe an option in the Query interface likequery.setUseInheritedProperties(true). What do you think of this ? Note : this is an extension of the JIRA HB-792 and could allow toresolve this case in a better way  William   -------------------------------------------------------This SF.Net email is sponsored by: YOU BE THE JUDGE. Be one of 170Project Admins to receive an Apple iPod Mini FREE for your judgement onwho ports your project to Linux PPC the best. Sponsored by IBM.Deadline: Sept. 24. Go here: http://sf.net/ppc_contest.php_______________________________________________hibernate-devel mailing list[EMAIL PROTECTED]https://lists.sourceforge.net/lists/listinfo/hibernate-devel      -------------------------------------------------------This SF.net email is sponsored by: IT Product Guide on ITManagersJournalUse IT products in your business? Tell us what you think of them. Give usYour Opinions, Get Free ThinkGeek Gift Certificates! Click to find out morehttp://productguide.itmanagersjournal.com/guidepromo.tmpl_______________________________________________hibernate-devel mailing list[EMAIL PROTECTED]https://lists.sourceforge.net/lists/listinfo/hibernate-devel   -- Emmanuel Bernard01.55.21.52.14Fnac - DSIDirection France - Nouvelles technologies67, boulevard du Gal Leclerc92612 Clichy Cedex